triethylamine tris(hydrogen fluoride) T=180°C; 9 h;

1: 86 percent / Et3N*3HF / 9 h / 180 °C 2: 98 percent / H2O2; H2O / acetic acid / 3 h / 80 - 88 °C 3: 84 percent / H2SO4*SO3 / CH2Cl2 / 20 h / 0 - 42 °C View Scheme

1: 86 percent / Et3N*3HF / 9 h / 180 °C 2: 98 percent / H2O2; H2O / acetic acid / 3 h / 80 - 88 °C 3: 79 percent / H2SO4*SO3 / CH2Cl2 / 1.5 h / 20 °C 4: 92 percent / acetonitrile / 1.5 h / 60 °C View Scheme

1: 86 percent / Et3N*3HF / 9 h / 180 °C 2: 98 percent / H2O2; H2O / acetic acid / 3 h / 80 - 88 °C View Scheme